Use client certificate from store in cpprestsdk

[ecepep]

I give a follow up to my issue which was closed because of my late answering 😬 (sry): https://github.com/dotnet/aspnetcore/issues/46482

I wish:

• to establish a websocket connection to a endpoint requiring a client certificate which is stored in the windows certificate store thanks to cpprestsdk;
• the possibility to receive a more verbose output on failure than a generic "TLS handshake failed".

I am using microsoft-signalr as an interface to cpprestsdk. I tryied to bind my client certificate as such:

void AddCertToCTX(boost::asio::ssl::context &ctx) {
    // Get context from windows store (_mystore & _myhash are correct. I used the same context for other successfull http request)
    PCCERT_CONTEXT clientCertificate = CertFindCertificateInStore(_mystore, X509_ASN_ENCODING,0,CERT_FIND_HASH,&_myhash,nullptr);

    SSL_CTX *handle = ctx.native_handle();

    X509_STORE *store = X509_STORE_new();
    X509 *x509 = d2i_X509(NULL,
                            (const unsigned char **)&clientCertificate->pbCertEncoded,
                            clientCertificate->cbCertEncoded);

    if(x509 != NULL) {
        X509_STORE_add_cert(store, x509);
        X509_free(x509);
    } 

    SSL_CTX_set_cert_store(ctx.native_handle(), store);
}

// [...]

web::websockets::client::websocket_client_config ws_cfg = cfg.get_websocket_client_config();
ws_cfg.set_ssl_context_callback([this](boost::asio::ssl::context &ctx) { AddCertToCTX(ctx); });
cfg.set_websocket_client_config(ws_cfg);

// [...]

// Output: [error    ] [websocket transport] exception when connecting to the server: set_fail_handler: 8: TLS handshake failed    

I failed to neither increase the verbosity or to get rid of this error.